Here are a couple of videos done by Hutch of Hutch-n-Son archery shop.
Hutch~n~Son face book

and their website

Although I'm not certain how long Hutches videos will be available they are a great technique and illustration for doing tag end serving on the end loops. Tag end, end-loops are nice because you can do an entire string or cable directly on a 2 post jig or stretcher. This makes the entire build time much shorter and the material costs are less.  They are also really clean and neat looking. It's a great technique so if you haven't tried it watch the videos and enjoy!

Tag end Video 1

Tag end Video 2